Circuit Diagram; Connection Terminals; Indicators; Function - DOLD SAFEMASTER S LH 5946 Traduction De La Notice Originale

Flashing Codes
Undervoltage
at U
H
Wire-break/offset
on L2
Wire-break/offset
on L3
Failure in feedback
circuit X1-X2
Simultaneity failure
signal L2/L3
Potentiometer error
U
an
Potentiometer error
t
s
Flashing codes of the LED „ERR" in sequence of priority

Circuit Diagram

53 54 L1 L2 L3
X1 X2 X3 11 23 33 43
11 23 33 43 53 A3+
K1
K2
12 24 34 44 54 A4
12 24 34 44
A3
A4 ON ERR A1 A2
+

Connection Terminals

Terminal designation Signal description
L1 - L2 - L3 Connection to monitored motor
11 - 12 Forcibly guided indicator output
23 - 24, 33 - 34, 43 - 44 Forcibly guided NO contacts for release circuit
53 - 54 Monitoring contact (NO)
Connection of feedback circuit
X1 - X2
(for external contactors)
X2 - X3 Manual reset for external faults
A1 - A2 Auxiliary supply (U
A3(+) - A4 Supply for semiconductor outputs
ON: Semiconductor output indicates state
of safety contacts
ERR: Semiconductor output indicates failures
Attention: The outputs ON and ERR are only monitoring outputs
and must not be used in safety circuits!

Indicators

green-red LED „UH":
yellow-green LED „OUT":
red LED „ERR":
t
ON ERR
M9163_e
)
H
green on, when operation
red on, with internal error
yellow on, at EMK > U
an
flashes green at time progression of t
permanent on, when output contacts
are enable
flashes at error in measuring and
feedback circuit and low auxiliary
voltage U (see flashing codes)
H

Function

The LH 5946 can be used for standstill detection on all 3-phase, single
phase and DC motors, that generate a voltage caused by remanence
when freewheeling. As the voltage level Uan for standstill monitoring and
the time delay ts, after detection of standstill until the safety relays are
switched on, are adjustable, the function can be adopted to different
motors and applications.
Basic function of LH 5946
The auxiliary voltage is connected to the terminals A1-A2; the LED „UH"
lights up green. On undervoltage or missing auxiliary supply the safety
outputs are disabled.
If semiconductor monitoring outputs are used, their supply voltage must
be connected to A3(+)-A4.
A motor connected to the terminals L1-L2-L3 of the LH 5946 generates
a voltage when running down (motor is switched off). The voltage is pro-
portional to the speed and caused by residual magnetism (remanence).
This voltage is measured redundant on 2 input channels via the terminals
M9648_c
L2 and L3 with L1 as common reference.
If the voltage drops on both channels below the adjusted value U
unit detects standstill. When the terminals X1-X2 of the feedback circuit
are bridged and the time delay ts is finished, the safety contacts 23-24,
33-34 and 43-44 close while contact 11-12 opens. All 4 contact paths
have 2 forcibly guided contacts of 2 safety relays wired in series.
At the same time the monitoring relay energises (53-54 closes), the se-
miconductor output „ON" is switched on and the LED „OUT" lights green.
During time delay ts this LED flashes.
If the voltage measured on terminals L1-L2-L3 of LH 5946 rises over
the adjusted value plus hysteresis in at least one channel (the motor is
switched on or the shaft turns mechanically), the forcibly guided output
contacts are switched off immediately (contacts 23-24, 33-34 and 43-44
open while contact 11-12 closes). The monitoring relay de-energises (53-
54 opened), the semiconductor output „ON" goes off and the LED „OUT"
lights yellow (= U over adjusted value).
an
Feedback circuit X1 - X2
If the safety contacts control external contactors/components (e.g. to re-
enforce or multiply the contacts) the safety function of them must be mo-
nitored.
This is done with the feed back circuit (terminals X1-X2) to which the
NC contacts of the contactors/components must be connected. (see also
wiring diagrams).
The LH 5946 will only enable its safety output if the feedback loop X1-X2
is closed while standstill is detected, i.e. the external contactors/compon-
ents are in initial state (NC contacts are closed).
The feedback circuit X1-X2 must be closed as long as the safety outputs
(because of running motor or external failure) are not enabled. If not the
failure „feedback circuit" is indicated.
If the feedback circuit is not used, the terminals X1-X2 must be bridged.
s
20
, the
an
LH 5946 / 22.03.22 en / 530A